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interface UserService { 
  
    suspend fun getProfile(): UserProfile 
    
    suspend fun getFinancialDetails(): FinancialDetails
  
    suspend fun finalizeOnboarding()
}

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interface UserService { 
    
    Single<UserProfile> getUserProfile(); 
    
    Single<FinancialDetails> getFinancialDetails(); 
  
    Completable finalizeOnboarding();
}

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interface CommunicationChannel {
    fun connect(credentials: Credentials)
    fun disconnect()
    fun getChannelDescription(): Description
}

data class Credentials(val secret: String, val key: String)

data class Description(
    val numberOfPeers: Int, 

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public inline fun CharSequence?.isNullOrEmpty(): Boolean {
    ...
}

public inline fun String?.orEmpty(): String {
    ...
}

public val CharSequence.indices: IntRange {
    ...

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val desc = SecuredCommunicationChannel.getChannelDescription()

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object SecuredCommunicationChannel {
    fun getChannelDescription(): String {
        ...    
    }
}

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public class SecuredCommunicationChannel {
    
    private static volatile SecuredCommunicationChannel instance;
    
    public static SecuredCommunicationChannel getInstance() {
        if (instance == null) {
            synchronized (SecuredCommunicationChannel.class) {
                if (instance == null) {
                    instance = new SecuredCommunicationChannel();
                }

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fun create(credentials: Credentials,
           channel: CommunicationChannel = SecuredCommunicationChannel(),
           loggingStrategy: LoggingStrategy = DefaultLoggingStrategy(), 
           host: String = Environment.PRODUCTION_HOST): Proxy {
    ...
}

/* This method could be called like this: */

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db.query(TABLE_NAME, columns, query, null, null, null, null, null);

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fun View.hide() {
    visibility = View.INVISIBLE
}

/* Now you can call the newly created method like this: */

val textView = TextView(context)
textView.hide()